on using his cell phone. he said it, i believed him. now he's giving me a reason not to believe him. >> reporter: our final test driver is mitch, a professional go-kart racer. >> i've been driving go-karts for probably about five years. >> reporter: he also told us he doesn't use his phone when he's driving. >> someone calls me, i don't normally answer it. i feel my phone vibrate in my pocket. i just wait. >> reporter: he tells his dad the same thing. >> we believe that he's not doing that because he's telling us he's not doing that. >> reporter: let's go to the tape. a few times, it's not his phone that's a distraction, it's female passengers. watch here as mitch speeds into a turn. his passengers are not only not wearing shirts, no one's wearing seatbelts. but does he ever pull out his cell phone? here it is. pressed against his ear while speeding through a turn. and here he's on the phone and does a one-handed u-turn across double yellow lines. >> this is probably illegal -- ugh! >> reporter: but the most